Search for an annual line in geomagnetic activity in middle latitudes

Details Search for an annual line in geomagnetic activity in middle latitudes Search for an annual line in geomagnetic activity in middle latitudes

Jun 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976jgr....81.2935c&link_type=abstract

Journal of Geophysical Research, vol. 81, June 1, 1976, p. 2935-2937.

Physics

2

Annual Variations, Geomagnetism, Magnetic Variations, Midlatitude Atmosphere, Diurnal Variations, Entropy, Magnetic Effects, Power Spectra

Scientific paper

Numerical experiment indicates that the strong annual term in absolute element geomagnetic data is primarily generated by seasonal modulation of the base line; daily variations themselves do not contribute significantly. A search for an annual line using Mayaud's (1973) aa magnetic activity index, where base line control has been lost, supports the experimental results. At mid-latitudes, evidence for an annual signal in magnetic activity is equivocal; if such a signal does exist, the amplitude is at most 1 gamma.

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